高性能聚羧酸减缩材料的研发(Ⅱ)——高分子聚合物(HP-SRA)的合成与表征

Development of High-Performance Polycarboxylic Acid Shrinkage-Reducing Materials( Ⅱ) ——Synthesis and Characterization of High Polymer( HP-SRA)

以减缩活性单体2-(2-丁氧乙氧基)乙醇丙烯酸酯(MBDEGAA)、丙烯酸(AA)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)与聚乙二醇单甲醚丙烯酸酯(MPEGAA)为聚合单体,在水溶液中通过聚合反应,合成了一种高分子聚合物(HP-SRA)。采用红外光谱、核磁共振氢谱和凝胶渗透色谱对HP-SRA分子结构和相对分子质量及其分布进行了表征。并测定了掺入质量分数为0.30%(固含量)的HP-SRA混凝土的减缩性能及应用性能。结果表明,当n(MPEGAA)∶n(MBDEGAA)∶n(AA)∶n(AMPS)=1∶2.15∶2.15∶1.10时,水泥砂浆减缩率最高,水泥净浆流动度及其保持能力最佳。在不影响混凝土应用性能基础上,减缩基团的引入有利于提高混凝土的减缩性能。

A high polymer（ HP-SRA） was synthesized from monobutyl diethylene glycol acrylate（ MBDEGAA）,acrylic acid（ AA）,2-acrylamide-2-methyl propane sulfonic acid（ AMPS） and methoxyl polyethylene glycol acrylate（ MPEGAA） by aqueous solution polymerization. The molecular structure of the high polymer（ HP-SRA） was characterized by means of Fourier transform infrared spectroscopy（ FTIR）,and1 H nuclear magnetic resonance（1HNMR）,respectively,and its relative molecular mass and distribution was analyzed by gel permeation chromatography（ GPC）. In the meantime,the shrinkage-reducing performance and other application performance in concrete were measured. The results show that the highest shrinkage ratio of cement mortar and the best fluidity and plasticization of cement paste are in the mole ratio of MPEGAA to MBDEGAA to AA to AMPS as1∶2. 15 ∶ 2. 15 ∶ 1. 10. The introduction of the shrinkage-reducing group can improve the shrinkage performance of concrete without sacrificing its application performance.